Meat saw



July 22, 1930.

s. F. FEISTER MEAT SAW Filed April 19, 1927 INVENTOR. '40); g

A TTORNEYJV Patented July 22, was

PATE T ,OFFFHIE GEORGE r. rnrsrna, or MARICOIPA, CALIFORNIA MEAT sawApplication filed April 19,

My invention relates to power driven saws for butchers use, and has forits principal object the provision of a simple, and easily and safelyoperated, power saw adapted to take the place of the ordinary butchershand saw in cutting through the bones of meat.

Other objects of the invention are to pro vide means for holding thework while being sawed, especially means for holding small round bones;to provide'means for supporting the saw to relieve the operator of itsweight; to provide suitable guards both to inclose the saw and toprevent the scattering of'bone dust; and toprovide means for auto,-

matically starting and stopping the saw.

Still further objects and advantages of the invention will becomeapparent from the following specification, which should be read with theunderstanding that the form, construction, and arrangement of theseveral parts therein described may be varied, within the limits of theclaims hereto appended, without departing from the spirit oft-heinvention as expressed in said claims With this in view a preferredembodiment of my invention willnow bedescribed fully with reference tothe accompanying drawings, wherein Fig. 1 is a side elevationof mycomplete device. r

Fig. 2 is a vertical section taken in the di rection of the arrows onthe line 2-2 of Fig. 1 and enlarged.

Fig. 3 is a horizontal section taken on the line 8-3 of Fig. 2.

In the drawings, and referringfor the moment to Fig. 1 thereof, thereference numeral 1 designates the usual butchers-blockon which the meatis cut. v 1 ard rigidly fixed to the floor adjacent the 7 block 1. 3 isavertically slidable bracket mountedupon the standard 2. I prefer toprovide rollers as indicated at it-to reduce the friction between thecollar 3 and the 5%; standard 2. There are preferably'three such rollersat the bottom of thecollar 3, two of which appear in the drawing, andthree rollers atthe top of said collar, two of these also appearing inthe drawing. A collar 5 is ad- 2 is a tubular stand-v 1 justably secureduponthe standard 2 to limit 1927. Serial No. 184,909.

the downward travel ofthe movable collar 3. An arm 6 extendshorizontally from the collar '3, and is pivotally secured thereto by abearing pin 7. A. chain or cable 8 is secured to the upper end of thepin 7 and passes over a pulley 9 mounted in a suitable bracket 10 at theupper end of the standard 2. The other end of the chain 8 extendsdownwardly within said standard, and is attached to a weight 11 adaptedto counterbalance the collar 8 and the parts attached to it by means ofthe arm 6. V V

A second arm 12 is mounted for horizontal swinging movement at the endof the arm 6, a bearing 13, to be described later, being providedbetwee'nsaid arms. The arm 12 sup-l ports a casting 14 which is the maincarrying frame of the saw. A hearing 13 is provided between said arm 12and said. cast ng 14: to permit the latter to turn freely in ahorizontal plane. A preferred form of said bearing is shown in Fig. 2,and comprises a pin 15Isecured in the casting 14 and extending throughthe end of the arm 12. Roller bearings, as indicated at 16, are providedto reduce friction. The bearing 13 between the arms 6 and 12 ispreferably similarly formed.

The frame casting 1-iis relatively wide and flat, and is hollow, asshown in Figs. 2and 3. At its lower end, itprovides a bearing 17, Fig.2, for a horizontal shaft 18 upon which the saw 19 is mounted. Anelectric motor 20 is secured to the face of the casting 14: with itsshaft 21 disposed preferably at an. angle of about 30 degrees from thehorizontal,-asshown in Fig. 1. Themotorshaft 21 is connected with thesaw shaft 18 by wormi gearing 22, Fig. 2, enclosed within a housing 23;An end thrustadjustmentis provided. for the saw sha'ft18 comprisinganadjustmg screw 24 in the end of the bearing 17 and a hardened ball 25in the'end of said shaft.

The circular saw'19.is secured to'the end of the shaft 18, in anysuitable mannenprefe'rably by means of a screw 26,.Fig. 2, pro 9 vid'edwith a large flat head 27 adapted. to bear against the outer face of thesaw. A ring28, squared or splined as indicated at 29 for non-rotatablefitting upon theend of the shaft 18, bears against the inner face of mo7 the saw, and said saw is clamped between the ring 28 and the fiat head27 of the screw 26 by means of screws or bolts 30. The saw is alsopreferably splined or squared to fit over the end of the shaft 29.

The saw 19 is enclosed by a guard comp ing an inner plate 31 and anouter plate 32 secured thereto, said outer plate having a centralaperture 32 to give access to the screws 30. The upper portion of saidguard is preferably rounded, as shown in Fig. 1, to conform to thecontour of the saw, and its lower edge is squared or horizontal. innerplate 31 of the guard is mounted for vertical sliding movement upon themain frame casting 14:, and is provided with a slot 33 through which thesaw shaft extends. The sliding connection between the guard plate 31 andthe frame 1% is provided by inter-engaging vertical flanged 'uides 3%and 35, Fig. 3, secured respectively to said guard plate 31 and saidframe let. A handle 36 is provided upon the forward edge of the guard,and a second handle 37 is attached to the frame 1 1.

The weight of the entire machine is balanced by the counterweight 11within the standard 2, and the pivotal connections of the horizontalarms 6 and 12 permit the saw to be moved in a horizontal plane to anydesired position over the block 1. In using the device, the operatorlowers it until the saw comes in contact with the work, indicated at 38in Fig. 1. The guard 3132 normally rests in its lowermost position uponthe frame 1 1, and in such position its bottom edge is approximatelyeven with the bottom of the saw. As the saw cuts through the work, theguard rests upon the upper surface of said work and rises upon saidframe 14:. The collar 5 is so positioned upon the standard 2 that whenthe movable collar 3 is in con act with it, the saw is almost touchingthe :p surface of the block 1, thereby preventing the cutting of saidblock by the saw. The

- 'uard )lat s 3132 are positioned as close to the sides of the saw aspossible.

A pair of vertically slidable rods are carried in guide brackets 10 uponthe re face of the guard plate 31, and are adapted to drop by gravity onto the surface of the block 1 on either side of the work 38 in order tohold said work in position beneath the The upper ends of said rods 39are provided with flanges, one of. which is shown at 11 in Fig.1, toprevent said rods from dropping out of their guides 40. Set screws 12,Figs 1 and 3, are provided in the guides 40 to the rods 39 in theirelevated positions their use as work holders is not desired. r freelyswinging plate 13, Fig. 1, is hung fron an arm 4-1- behind and in linewith the saw t: prevent bone chips or dust from flving. The arm 4% ispivoted to the guard plate 31 at and a stop i6 is provided to limit i'sdown.- ward movement. The bottom of the guard 13 rests upon the top ofthe block 1 as the saw guard 3132 is lowered to position upon the top ofthe work.

The electric wires for supplying current to the motor 20 are led throughthe arms 6 and 12, which are made hollow to receive said wires. Thewires preferably in the form of a cable indicated by the numeral 47 maybe introduced into the arm 6 at any desired point, as shown in Fig. 1.At the swivel joint 13 between the two arms, and at the second swiveljoint 13 between the arm 12 and the saw frame 14, I provide suitableelectrical contacts, in order not to interfere with the movement of saidjoints. A preferred form of such contact arrangement is shown in Fig. 2,at the joint 13.

Contact rings -18 are mounted in a suitable insulating material 19 inthe upper part of the frame 1 1, and are arranged concentrically aboutthe pivot pin 15. Three such contact rings are shown adapted for threephase current. In the arm 12 are arranged three spring pressed contactbrushes 50, mounted in a suitable insulating structure 51, and adaptedto make sliding contact with the respective rin s 18. The brushes 50 areconnected with the three wires of the cable l7, and the three rings 4C8are connected by a cable led through the interior of the fram casting 11, and connected with one set of contacts of a switch indicated at 53.This switch, which may be of any suitable type, is mounted in a casing 51 projecting from the front face of the frame 1% and carrying the handle37. The other contacts of said switch are connected with the motor 20.

The switch 53 is operated by a sliding bolt or button 55 extending upthrough the handle 37 and projecting from its upper end. spring 56normally retains the bolt 55 in its uppermost position, thereby holdingthe switch 53 open. In order to close said s vitch to start the motor20, the operator must depress the button 55, and must hold it depressedin order to keep the motor running. Therefore, if the operator removeshis hand from the handle 37, the current is at once shut off, and thesaw stops.

t will be seen that my device is not only sy and convenient to operate,but is safe as well. The automatic switch described above prevents theoperation of the saw unless the operator has his hand on the handle 37.The saw guard 31-32 being slidable upon the saw frame 1 1 and restingupon the top of the work, encloses the saw adequately and eliminates anydanger of contact therewith. The position of the motor 20 prevents anyundue amount of turning force from being supplied to the saw casting 14,so that there is no danger of said casting twisting out of the operatorsgrasp upon starting'the motor. The arrangement of the two handles 36 and37, moreover, gives the operator complete control over the device. Theslidable work holdand a driving connection between said motor ing rods39 prevent the work from being shaft and said horizontal shaft.

kicked out by the action of the saw, even if In testimony whereof I havesigned my small round bones are being cut. In working name to thisspecification.

on large pieces of meat whose weight would hold them down upon theblock, the rods 39 may be held up out of the way by the set screws 42.The dust guard 43 prevents the flying of bone chips or dust. 1

The saw is easily cleaned by dipping it i into hot water and running thesaw therein for a few seconds. The water maybe kept in any suitablevessel, not shown, placed beside the block 1 and at about the levelthereof. The arrangement of the arms 6 and 12 and the sliding collar 3enables the saw to be moved into any position upon the block, and theinclusion of roller bearings at all points of movement enables thepositioning of the saw to be done with the least possible eflort.Finally, the saw can be removed for sharpening or replacement, withoutdismantling any other parts of the machine. The aperture 32 in the outerguard plate 32 permits the removal of the locking screws 30 and theclamping screw26-27, whereupon the saw can he slipped 01f the end of theshaft 18 and removed from the bottom of the guard.

I claim 1. A meat saw apparatus comprising a frame; a substantiallyhorizontal shaft journaled therein; a saw carried by said shaft; and apair of substantially vertically slidable work-holding membersassociated with said frame, one 011 each side of said shaft, and adaptedto be lowered on either side of the work.

2. A meat saw apparatus comprising a supporting arm; a saw framedepending therefrom and rotatably mounted about a vertical pivot, saidframe being vertically disposed and having greater width than thickness;a horizontal shaft journaled in the lower portion of said frame at rightangles to the width thereof; a saw carried by said shaft on one side ofsaid frame; a motor mounted upon the other side of said frame, saidmotor having a shaft inclined in a vertical plane parallel to saidframe; and driving connections between said motor shaft and saidhorizontal shaft.

3. A meat saw apparatus comprising a supporting member; a saw framedepending therefrom and rotatablymounted about avertical pivot, saidframe being vertically disposed and offset laterally from the centerline of said pivot; a horizontal shaft journaled in said frame; asawcarried by said shaft on one side of said frame; a motor car- I riedupon the other side of said frame with its shaft inclined in a verticalplane parallel with said frame, the weight of said motor, said frame andsaid saw being approximately balanced about said pivot;

GEORGE F. FEISTER.

